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Next-to-Next-to-Leading Order QCD Corrections to Polarized Semi-Inclusive Deep-Inelastic Scattering.
Phys Rev Lett
November 2024
The Institute of Mathematical Sciences, Taramani, 600113 Chennai, India.
Article Synopsis
- Polarized semi-inclusive deep-inelastic scattering (SIDIS) plays a crucial role in understanding the proton spin puzzle.
- The study presents comprehensive results for polarized SIDIS at next-to-next-to-leading order (NNLO) in quantum chromodynamics, covering all relevant interactions.
- A numerical analysis highlights the importance of NNLO corrections and demonstrates reduced scale dependence, particularly for the kinematics relevant to future electron-ion collider experiments.
Polarized Semi-Inclusive Deep-Inelastic Scattering at Next-to-Next-to-Leading Order in QCD.
Phys Rev Lett
November 2024
Università degli Studi di Milano-Bicocca and INFN, Piazza della Scienza 3, 20216 Milano, Italy.
Semi-inclusive hadron production in longitudinally polarized deep-inelastic lepton-nucleon scattering is a powerful tool for resolving the quark flavor decomposition of the proton's spin structure. We present the full next-to-next-to-leading order QCD corrections to the coefficient functions of polarized semi-inclusive deep-inelastic scattering (SIDIS) in analytical form, enabling the use of SIDIS measurements in precision studies of the proton spin structure. The numerical impact of these corrections is illustrated by a comparison with data of polarized single-inclusive hadron spectra from the DESY HERMES and CERN COMPASS experiments.
View Article and Find Full Text PDFNew Data-Driven Constraints on the Sign of Gluon Polarization in the Proton.
Phys Rev Lett
October 2024
CSSM and ARC Centre of Excellence for Dark Matter Particle Physics, Department of Physics, University of Adelaide, Adelaide 5005, Australia.
Article Synopsis
- - The potential existence of negative gluon helicity (Δg) has been found to align with current data from experiments like polarized proton-proton collisions and lattice QCD measurements.
- - A new analysis of polarized parton distributions in protons introduces constraints from high-x deep-inelastic scattering (DIS).
- - Results indicate that models incorporating negative Δg struggle to match high-x DIS data alongside other experimental data, implying that negative Δg may not be a viable solution.
Final COMPASS Results on the Transverse-Spin-Dependent Azimuthal Asymmetries in the Pion-Induced Drell-Yan Process.
Phys Rev Lett
August 2024
Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland.
The COMPASS Collaboration performed measurements of the Drell-Yan process in 2015 and 2018 using a 190 GeV/c π^{-} beam impinging on a transversely polarized ammonia target. Combining the data of both years, we present final results on the amplitudes of five azimuthal modulations, which correspond to transverse-spin-dependent azimuthal asymmetries (TSAs) in the dimuon production cross section. Three of them probe the nucleon leading-twist Sivers, transversity, and pretzelosity transverse-momentum dependent (TMD) parton distribution functions (PDFs).
View Article and Find Full Text PDFFirst Measurement of Hard Exclusive π^{-}Δ^{++} Electroproduction Beam-Spin Asymmetries off the Proton.
Phys Rev Lett
July 2023
Argonne National Laboratory, Argonne, Illinois 60439, USA.
The polarized cross-section ratio σ_{LT^{'}}/σ_{0} from hard exclusive π^{-}Δ^{++} electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV/10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab.
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